Ustream.tv is a website which consists of a network of diverse channels providing a platform for lifecasting and live video streaming of events online. Established in March 2007, the site has over 2,000,000 registered users who generate 1,500,000+ hours of live streamed content per month with over ten million unique hits per month.[3] It received $11.1 million in Series A funding for new product development from DCM and investors Labrador Ventures and Band of Angels.

During the 2008 United States presidential election, the website was used by nearly all of the major candidates to help their campaigns, by allowing a greater number of voters to ask political questions. Former Senator and 2008 Presidential Candidate Mike Gravel became the first candidate ever to stream an alternate debate on Ustream that allowed Sen. Gravel to respond to all of the questions being asked, as well as comment on the responses from the other candidates throughout a nationally televised debate.